Screw feed type pencil with cushioned lead holding means



July 22, 1952 P. A. sHARRow 2,604,070

SCREW FEED TYPE PENCIL WITH CUSHIONED LEAD HOLDING MEANS Filed July 13 1946 y fare/vra? )L-fry. l 'Jl/@kow .mmmlmi "of inward movement of the lead.

Patented July 22, n.1952

SCREW FEED 'rrrE PENCIL ,WITH Guen.; f

IONEDLEAD HOLDING MEANS 'Y Percy A. SharrowIDetroit', l

Appiioaiioii July is, 194s, sefiaiiiogtsaise* i' 1 claim. (ci. :120V-.49)

Y My invention relates to a new and useful improvement in a screw feed type pencil with cushionedlead holding means and of that type in which the lead is fed through a tube so thatwhen the lead has been used itV may be replaced with another stick of lead.

It is an object of the present invention'to provide a pencil of this type so constructed and arranged thatthe leadmay be moved inwardly yfand'outwardly of thev pencil during a writing operation so thatffatigueuresulting from writing mayl be reducedto a'minimum`.

Another object of the invention: is they provision in a pencil of this type of a springmeans for 'resisting the inward movement of the lead relatively to the 'pencilv so arranged and constructed `that it maybe adjusted to various tensions.

Another object of the invention is the provision in a pencil of' this type of a spring resisting inward movement of the pencil and comprising a plurality of closed tight Wound separate' coils which are connected to each other but positioned in spaced relation to each other.

" Another object 'of the inventionis the provision ina pencil of'this type of rresilient means for resisting 'inward movement of the lead while the pencilis'being used and socon'structed andar- 'ranged lthat afree and easy movement of the lead inwardly 'maybe effected andvarious coils ofv a spring coiled'into actionat different, stages Another object of the invention is the provision in a pencil of this type which will be simple 'in structure, 'economicalto manufacture, durable,

compact, light and highly efficient in use. Other objects will appear hereinafter.

toextend lthe full lengtlwof the tbe IBfis `a 'spirally wound ribbon 23 of metal tol-provide'a spiral thread. Projecting outwardly from the tubev 20 through the slot 'i9 -in tube I8 and' en- 411; is recognized that various modifications and changes may be made in the detail of structure illustrated without departing from the invention itself and it is intended that such variations and changes may be embraced within the scope of 'the claim which forms a part hereof.

Forming a part of this specification'are drawv'ingsin which, v a 1 Y s .'jFig. 1 is a longitudinaLIcentra-l, ver-tical,"sec

tional View of the invention,

Fig. 2 is a sectional view taken on line 2`2ncf ,Figi 1! c an enlarged sectional view taken on yformed the point il.y

. 23, is a'lug 22. plunger 24 isa lug 25 which extends vthrough a of the' metal tubeffand parts contained therein,

constituting the lead'holder, taken' on line G-L-' QfFg. 2. "c I t As shown in the drawings "the invention'com- `prises a pairof tubular parts 1 and 8` andan end piece or nose 9 having a threaded neck I0 which threads vinto :the metal lining tube II. Throughout a portion 'of 'the'lengthof this -tube Il areiormed diametricallyopposite axiallydirectedslots vI2 and'l3. It will be noted that the tubes "'I. and 8 arefin'an 'alignment'andthat the ',tube'jII extendsiro'rn the member rIIlthrogh.the

remaining Aportion 'of thet-ube 8f This tube vII also extendsinto the tube'l',the tubes 1 and 8 being spaced apart at their adjacent ends by 'a structure whichwill be described. This tube I I has at its end the diagonally directed flange'l.

which engages the end facev of the tube 1. y

A4 lead holder'is associated with thesel parts and will be described. l I;

A metal tube" Ilprojects through the bore I'I Slidably projecting through the closed end of this tubel is a metal tube I8 having alongitudinally directed slot I9 formed therein from end to end. Slidably mounted in this tube I8 is the `plunger containing tube 20 into which the end of the lead 2I is adapted to project to engage the end of the plunger 24 which is positioned irfi the tube zo." Positionedil within the tube I6 and embracing the tube'l,

gaging in the space between the turns of the spiral Projecting outwardly from vthe f slot 25 formed inthe tube 2,0 and which also ex- .tends,tlnoughvslotv I0'V of tube I8 ,andv engages in this.y spiral lthread' .between the tu'rns 23.A

Fixedly mounted in .the end of the tube I Il isa block` 29 having a recess yZiljormedtherein which ,includesfat'oppositesides thereof the axially directed' grooves,-,3l.f:Fixedly mounted on the end 1 of theftube I8. is a head 2l having thediametrif cally'opposite lugsl 3l) projecting outwardly therefroml andengaging inthe grooves 3|.' The construction is such that when the point 9 is rotated the tube II will also rotate and 'carry with itthe block 29 thus effecting a rotation of the tube I8. The spirally wound ribbon 23 is in fixed relation to the tube I5 so that a rotation of the tube I8, relatively to the tube I6, would effect a movement of the plunger 24 either inwardly or outwardly through which the tube I6 projects. ProjectingI outwardly from the periphery of l` theu adjusting plug 31 are the diametrically oppositet'eeth'forrna ing projections 40 and 4I which project through' the slots I2 and I3 respectively through .1;l1erri`e'ar.` end of tube I I and mesh withvthreads r4,4 formed on the inner surface of the adjusting sleeve-i3.

Bearing against one end of the memberM31wis-afcoil spring the opposite end of which bears against -arlzollar '4 6f--xedly mounted onthe tube,.I 6.. This fcoil spring l: comprisesffanpluralty of closed ,coils 4 e the pencil will be resisted by a predetermined pressure of a spring embodying the coils 44a. When the inward pressure is released the coils 44a will, of course, move the point 2| outwardly and the spring 41 will serve to cushion this outward movement. Experi-mentation has shown that in order to obtain 'a desired flexibility or floating arrangement of the point with a spring resisting the inward, -movement,1a-coi1 spring constructed as described is,.,most;eiiicient.

Buoyant cushioned eiect is had with perfect Afreedom of movement, also the point adheres to the papenmorethan does the rigid point.

-In ,construction of the coils 44a and 45, one or more of the close Wound coils are formed and spaced apart from the next adjacent coil or coils not..l more than the diameter of the coil, and these coils are connected by a resilient means or wire.

Eachlcoil part acts as a seat or support for yield- 44a which are spaced apart `from each otherf'and y connectedsby the diagonally iextending .active or 4yieldable part of thewire. asat 45. Itis preferred thatA there .be -one or :more turns l.to Wmalte .the fclosedcoils-Ma and thatfthecoilsbe spaced apart `a distance notv less ...than the :diameter of .the coil withthe extending, parts acting as resilientmeans.

, Experience has rshown that. a spring of lthis type is: quite fdesirable-fin--order that. the action, re-

quired -may: be obtained.-v -Experience A has .Y also shown that the ordinaryl wound.. .coil is.; too slow as.torsionis exertedon the fulljle'ngthiof fthe wire-.theV thrust-t;einggslowerito,.arrive at .starting point thus: the .-.short wire results :in a quicker recoil.

A smallencoil zspringgd'l., constructedsimi-larly tov` the spring; embodyingtheY coils-- 44a/ bears at one end against the oppositefaireofl thecollar 46Qand at l its-opposite endagainst. the v-bottom of i'heffsocket .,-46 -formed point v9.. The purpose sito cushion; the recoil as. thewrviter.. relaxes his pressure-gon -thefpenciland-v .prevent the collar,46

from-forciblystriking.the-heads.:

theuse;v -tlie--user-.oithe pencil would, Y while Yholding ;.;the'epart*1- in theluand, rotate kthepoint or-1-head 9 so: that the .plungerld would. be 're- Itracted.' The lead Irrwouldthenbe .placed in position within' .thetubeL I9. and .the plunger fthen v-inoyedfso thata-thefleari '21 would .project :beyond .th'eetapered lpoint of :the tube I 6 and the V.snirally -would- 'bandf-ZS.'

When; the apencil: .is fr being', used the pressure tendency-throughengagement Witnthelplunger 2.4...t'o .move thentub'eJI'I longitudinally inwardly togetherY with the partsassembled in association with thertube I5, tubeand these parts const'iturmggtne iead holder. This inward movement would,f of course, be resistedby the spring jembod'yingsthe spaced section of wire ofs'ftliecoils Vav and assisted by; the spring embodying-fthe coils'j'4`1. By; rotating the iA-membeiv4'4 Y the memben/31 maybe-movedztofeither increase fondiiinable part connecting the coiled parts.

If. desired by the writer thepencilimay be adjusted .to provide ,av rigidbrk stationary. point -i-nstead of the iioatingV point by rotatngthe adjusting sleeve =43 until the` adjusting. plug `31 has traveled toabut against a face. of collar 35 preventing relative travel of the tube I6 to the .plug 31. Thisalso compresses ythe vsprings suiciently Slo that the collar 46 vrests againstvthe head .9 thereby preventing the sleeveA I6 from moving outwardly ofl the pencilbeyond a fixed position.

Thus .there is provided .a pencil Where the 'point can be held rigid or easily. adjustedto .suit fthe requirement of the .writer in a Boating point. 2

y What I claim is In apencil ofthe class described,t a -tubular body; alead holder mountedin said bodyand extending -axially thereof and movable axially inwardlyl and outwardly ofsaid body; afnormally stationary abutment member insa-id body; acollar mounted yon said holder between the ends thereof. and projectingv radially therefrom; a

springembraci-ng said holder and engaglgat one end with said bodyand at the` oppositeVI end with vone facevof said collar; a second -spring embracing; said'xholder'y and'fengaging at ones end withthe opposite face `offsaid collarandat itsopp'osite end-'With said Vabutment imam-beni said springs veach'. comprisinga plurality vof 'groups off axially. spaced::apartk fcoils; the opposed turns `1n adjacent groups being iconne'ctedzby a diag.-

onally directed: resilient portion', the ,spacing-fof thegroupsfoil each Aspring beingzznot Amore than the diameterofthecoils. c

' PERCY'A. SHARR'OW? REFEREUICESl `CITED The frfollowing w references are of record-"inthe `file-ofthis patent UNIrEnsPTATEs. PATENTS i Number Name; Date:

736 Addison May 10, 1838 Vi97g8'1`3 Hagenmeyer i May-23g 1893 k1,415,772 Allen Nov: 27, 1923 1,490,834' Kristofek Apr. 15,v 1924 Y l FoREiGN--PATENTS' Number Country Date-f 606,583 France Man-.12,1926 

